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Not all at-home red-light devices have been thoroughly, independently tested, researchers say. Credit: Guy Corbishley/Alamy

In 2021, dermatologist David Ozog was on holiday with his family in the Bahamas, when his 18-year-old son had a massive stroke. The teenager was airlifted to Florida, and then to Chicago for surgery. As his son was lying partially paralysed in a hospital bed, Ozog got a call from a colleague who had an unconventional suggestion.

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